A juxtarenal myelolipoma in a cottontop marmoset (Saguinus oedipus): A case report.

A myelolipoma was surgically removed from the abdomen of a 15-year-old female cottontop marmoset (Saguinus oedipus). Because of its close adherence to the right kidney, a unilateral nephrectomy was performed. The post-surgical recovery was uneventful. A myelolipoma is a circumscribed mass of bone marrow elements embedded in mature adipose tissue. These masses have been reported in the adrenal glands, paravertebral tissue, intrathoracic tissues, and mesentery of man. A similar condition has been observed in the liver and spleen of both captive and wild felidae. This report documents the first observation of this tumor-like condition in nonhuman primates with the possible exception of a subcutaneous myeloliposarcoma in a potto.